51.   The San Francisco City Council required the entire population to wear surgical masks.

52.   The two shows will butt surgical masks in most of the nation.

53.   The worsening pollution has brought intense buying of surgical masks, which people use to keep from breathing the smoke.

54.   The youths and the monks held white surgical masks over their faces as they exited.

55.   Their parents were allowed to visit, but to the girls they were simply two more visitors who had to wear surgical masks to keep from spreading germs.

56.   There she is in a wheelchair, bald and frail, her face shielded by a surgical mask, a white hospital blanket draped over her knees.

57.   They were just in her hospital room where, for her own protection, her staff wore surgical masks and gowns.

58.   They covered his face with a surgical mask because he was spitting at deputies.

59.   They wear surgical masks outside to make sure no one will catch their colds.

60.   They wore long sleeves and surgical masks for protection against the dust.

a. + mask >>共 308
surgical 18.18%
black 8.98%
protective 4.04%
white 3.70%
african 2.24%
breathing 2.13%
plastic 1.68%
emergency 1.57%
facial 1.46%
traditional 1.23%
surgical + n. >>共 296
procedure 12.28%
mask 9.38%
team 4.81%
instrument 4.40%
abortion 4.05%
glove 4.00%
technique 3.30%
removal 2.26%
patient 1.80%
precision 1.74%
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